21121121121222 has 16 divisors (see below), whose sum is σ = 42616067396400. Its totient is φ = 6978069514752.

The previous prime is 21121121121179. The next prime is 21121121121251. The reversal of 21121121121222 is 22212112112112.

It is a super-2 number, since 2×21121121121222² (a number of 27 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15576047347 + ... + 15576048702.

It is an arithmetic number, because the mean of its divisors is an integer number (2663504212275).

Almost surely, 2^{21121121121222} is an apocalyptic number.

21121121121222 is an abundant number, since it is smaller than the sum of its proper divisors (21494946275178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21121121121222 is a wasteful number, since it uses less digits than its factorization.

21121121121222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31152096167.

The product of its digits is 128, while the sum is 21.

Adding to 21121121121222 its reverse (22212112112112), we get a palindrome (43333233233334).

The spelling of 21121121121222 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-two".